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One ounce of a well-known breakfast cereal contains 104 Calories (1 food Calorie = 4186 J). If 2.5% of this energy could be converted by a weight lifter's body into work done in lifting a barbell, what is the heaviest barbell that could be lifted a distance of 2.3 m??

Respuesta :

MechEngineer

Answer:

482.4 kg

Explanation:

104 calorie = 435344  J

The 2.5% of this energy equals to

435344  * 0.0025 = 10883.6 J

If this energy is converted to work done on lifting a barbell by a distance of 2.3. By the formula of Work W = force * distance then the force he exerts on the barbell is

[tex] F = \frac{W}{D} = \frac{10883.6 }{2.3} = 4732  N[/tex]

Assuming gravitational constant g = 9.81 m/s2 then the mass of the barbell is

m = 4732  / 9.81 = 482.4 kg

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